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Automated resonance assignment of proteins: 6D APSY-NMR

Date Issued
2006-01-01
Author(s)
Fiorito, Francesco
Hiller, Sebastian  
Wider, Gerhard
Wüthrich, Kurt
DOI
10.1007/s10858-006-0030-x
Abstract
The 6-dimensional (6D) APSY-seq-HNCOCANH NMR experiment correlates two sequentially neighboring amide moieties in proteins via the C` and Calpha nuclei, with efficient suppression of the back transfer from Calpha to the originating amide moiety. The automatic analysis of two-dimensional (2D) projections of this 6D experiment with the use of GAPRO (Hiller et al., 2005) provides a high-precision 6D peak list, which permits automated sequential assignments of proteins with the assignment software GARANT (Bartels et al., 1997). The procedure was applied to two proteins, the 63-residue 434-repressor(1-63) and the 115-residue TM1290. For both proteins, complete sequential assignments for all NMR-observable backbone resonances were obtained, and the polypeptide segments thus identified could be unambiguously located in the amino acid sequence. These results demonstrate that APSY-NMR spectroscopy in combination with a suitable assignment algorithm can provide fully automated sequence-specific backbone assignments of small proteins.
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